Is Mastering needed in Extreme Metal?

[Massive Master]

Most gracious, thank you. Where's the "blush" icon...?

Nope...

Ayya... Not that one...

Nice, but not the one either.

Close enough.

 

[Scorge]

I don't know what mastering means but I always tweak the bounced final mix in terms of EQ/loudness/multiband compression to make sure it sounds good through everything. Then again, my final mixes usually have a bit of mud to them that I like to clean up.